diff --git a/common/changes/@visactor/vchart/fix-legend-filter-after-updatespec_20260421.json b/common/changes/@visactor/vchart/fix-legend-filter-after-updatespec_20260421.json
new file mode 100644
index 0000000000..05cfdb91f7
--- /dev/null
+++ b/common/changes/@visactor/vchart/fix-legend-filter-after-updatespec_20260421.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@visactor/vchart",
+      "comment": "fix: preserve discrete legend filtering after updateSpec when `legends.data` is a callback (Issue #4566)",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@visactor/vchart",
+  "email": "openai@example.com"
+}
diff --git a/packages/vchart/__tests__/unit/core/vchart-event.test.ts b/packages/vchart/__tests__/unit/core/vchart-event.test.ts
index 993e3c13d8..536b33e0c5 100644
--- a/packages/vchart/__tests__/unit/core/vchart-event.test.ts
+++ b/packages/vchart/__tests__/unit/core/vchart-event.test.ts
@@ -193,3 +193,133 @@ describe('vchart event test', () => {
     expect(handleTooltipRelease).toBeCalledTimes(1);
   });
 });
+
+describe('discrete legend with custom data after updateSpec', () => {
+  let container: HTMLElement;
+  let dom: HTMLElement;
+  let vchart: VChart;
+
+  const data1 = [
+    { x: '周一', type: '早餐', y: 15 },
+    { x: '周一', type: '午餐', y: 25 },
+    { x: '周二', type: '早餐', y: 12 },
+    { x: '周二', type: '午餐', y: 30 }
+  ];
+
+  const data2 = [
+    { x: '周一', type: '早餐2', y: 15 },
+    { x: '周一', type: '午餐2', y: 25 },
+    { x: '周二', type: '早餐2', y: 12 },
+    { x: '周二', type: '午餐2', y: 30 },
+    { x: '周一', type: '饮料2', y: 22 },
+    { x: '周二', type: '饮料2', y: 43 }
+  ];
+
+  beforeEach(() => {
+    container = createDiv();
+    dom = createDiv(container);
+    dom.id = 'container';
+    container.style.position = 'fixed';
+    container.style.width = '500px';
+    container.style.height = '500px';
+    container.style.top = '0px';
+    container.style.left = '0px';
+
+    const spec = {
+      type: 'common',
+      animation: false,
+      data: [
+        {
+          id: 'id0',
+          values: data1
+        }
+      ],
+      seriesField: 'type',
+      legends: [
+        {
+          orient: 'right',
+          visible: true,
+          data: (items: any[]) => items
+        }
+      ],
+      series: [
+        {
+          type: 'line',
+          id: 'line',
+          dataIndex: 0,
+          xField: ['x'],
+          yField: 'y'
+        }
+      ],
+      axes: [
+        { orient: 'left', seriesIndex: [0] },
+        { orient: 'bottom', label: { visible: true }, type: 'band' }
+      ]
+    } as any;
+
+    vchart = new VChart(spec, {
+      dom,
+      animation: false
+    });
+    vchart.renderSync();
+  });
+
+  afterEach(() => {
+    vchart.release();
+    removeDom(container);
+  });
+
+  it('should keep legend filtering working after updateSpecSync without remake', () => {
+    const nextSpec = {
+      ...vchart.getSpec(),
+      data: [
+        {
+          id: 'id0',
+          values: data2
+        }
+      ],
+      legends: [
+        {
+          orient: 'right',
+          visible: true,
+          data: (items: any[]) => items
+        }
+      ]
+    };
+
+    vchart.updateSpecSync(nextSpec, false, undefined, {
+      change: false,
+      reMake: false
+    });
+
+    const legend = vchart.getComponents().find(com => com.type === 'discreteLegend') as any;
+    const legendComponent = legend.getVRenderComponents()[0] as any;
+    const legendItem = legendComponent._itemsContainer.getChildren()[0];
+    const series = vchart.getChart()?.getAllSeries()[0];
+    const vrenderLegendClickSpy = jest.fn();
+
+    legendComponent.addEventListener('legendItemClick', vrenderLegendClickSpy);
+
+    expect(legend.getLegendDefaultData()).toEqual(['早餐2', '午餐2', '饮料2']);
+    expect(series?.getViewData()?.latestData.map((datum: any) => datum.type)).toEqual([
+      '早餐2',
+      '午餐2',
+      '早餐2',
+      '午餐2',
+      '饮料2',
+      '饮料2'
+    ]);
+
+    legendComponent._onClick({ target: legendItem });
+
+    expect(vrenderLegendClickSpy).toHaveBeenCalledTimes(1);
+    expect(vrenderLegendClickSpy.mock.calls[0]?.[0]?.detail?.currentSelected).toEqual(['午餐2', '饮料2']);
+    expect(legend.getSelectedData()).toEqual(['午餐2', '饮料2']);
+    expect(series?.getViewData()?.latestData.map((datum: any) => datum.type)).toEqual([
+      '午餐2',
+      '午餐2',
+      '饮料2',
+      '饮料2'
+    ]);
+  });
+});
diff --git a/packages/vchart/src/component/legend/base-legend.ts b/packages/vchart/src/component/legend/base-legend.ts
index 8a289e532d..95dcf7eb50 100644
--- a/packages/vchart/src/component/legend/base-legend.ts
+++ b/packages/vchart/src/component/legend/base-legend.ts
@@ -304,6 +304,7 @@ export abstract class BaseLegend<T extends ILegendCommonSpec> extends BaseCompon
 
   clear(): void {
     super.clear();
+    this._legendComponent = null;
     this._cacheAttrs = null;
     this._preSelectedData = null;
   }
diff --git a/specs/011-fix-discrete-legend-filter-after-update-spec/plan.md b/specs/011-fix-discrete-legend-filter-after-update-spec/plan.md
new file mode 100644
index 0000000000..3321da7e89
--- /dev/null
+++ b/specs/011-fix-discrete-legend-filter-after-update-spec/plan.md
@@ -0,0 +1,44 @@
+# Implementation Plan: Fix Discrete Legend Filtering After updateSpec
+
+**Branch**: `011-fix-discrete-legend-filter-after-update-spec` | **Date**: 2026-04-21 | **Spec**: [/Users/bytedance/Documents/GitHub/VChart3/specs/011-fix-discrete-legend-filter-after-update-spec/spec.md](/Users/bytedance/Documents/GitHub/VChart3/specs/011-fix-discrete-legend-filter-after-update-spec/spec.md)
+**Input**: Feature specification from `/specs/011-fix-discrete-legend-filter-after-update-spec/spec.md`
+
+## Summary
+
+Fix the discrete legend regression reported in issue #4566 by clearing the stale vrender legend instance during `BaseLegend.clear()`. The root cause is that the `reCompile` path releases the old legend component but leaves `_legendComponent` populated, so the next layout pass reuses a dead instance and skips the event-binding path that connects legend clicks back into VChart filtering. Add a focused regression test that reproduces `updateSpecSync(..., { reMake: false })` with `legends.data: items => items`.
+
+## Technical Context
+
+**Language/Version**: TypeScript 4.9.x  
+**Primary Dependencies**: `@visactor/vrender-components`, `@visactor/vutils`, `@visactor/vdataset`  
+**Testing**: Jest 26 unit tests under `packages/vchart/__tests__`, plus `tsc --noEmit`  
+**Target Platform**: Browser and cross-platform chart runtime  
+**Project Type**: Monorepo charting library package (`packages/vchart`)  
+**Constraints**: Keep the fix scoped to legend lifecycle cleanup; avoid changing discrete legend filtering semantics; preserve existing `reMake: true` behavior
+
+## Constitution Check
+
+- Pass: The change is narrowly scoped to the documented bug path.
+- Pass: The fix reuses the existing legend rebuild path instead of adding a new special-case update branch.
+- Pass: Regression coverage is added for the exact user-visible interaction.
+
+## Project Structure
+
+```text
+specs/011-fix-discrete-legend-filter-after-update-spec/
+├── plan.md
+├── spec.md
+└── tasks.md
+```
+
+```text
+packages/vchart/
+├── src/component/legend/base-legend.ts
+└── __tests__/unit/core/vchart-event.test.ts
+```
+
+## Implementation Strategy
+
+1. Reproduce the regression with a focused event test that uses a discrete legend `data` callback and `updateSpecSync(..., { reMake: false })`.
+2. Fix legend lifecycle cleanup by nulling `_legendComponent` after releasing the old vrender component so the next compile path recreates and rebinds it.
+3. Run the focused Jest test file and TypeScript compile check to verify the regression and avoid collateral breakage.
diff --git a/specs/011-fix-discrete-legend-filter-after-update-spec/spec.md b/specs/011-fix-discrete-legend-filter-after-update-spec/spec.md
new file mode 100644
index 0000000000..57b5a8aeb6
--- /dev/null
+++ b/specs/011-fix-discrete-legend-filter-after-update-spec/spec.md
@@ -0,0 +1,43 @@
+# Feature Specification: Fix Discrete Legend Filtering After updateSpec
+
+**Feature Branch**: `011-fix-discrete-legend-filter-after-update-spec`  
+**Created**: 2026-04-21  
+**Status**: Draft  
+**Input**: User description: "Fix VChart issue #4566: after `updateSpec`, clicking a discrete legend with a custom `data` callback no longer triggers legend filtering unless `reMake` is true"
+
+## User Scenarios & Testing *(mandatory)*
+
+### User Story 1 - Keep Discrete Legend Filtering Active After updateSpec (Priority: P1)
+
+As a chart author using a discrete legend with a custom `data` callback, I want legend clicks to keep filtering the latest series data after `updateSpec(..., { reMake: false })` so that I can update chart data without remaking the chart and losing legend interaction.
+
+**Why this priority**: The reported bug breaks the primary discrete-legend interaction path immediately after a common update flow and regresses behavior that previously worked in 1.x.
+
+**Independent Test**: Render a chart whose legend uses `data: items => items`, call `updateSpecSync` with new legend values and `reMake: false`, click a legend item, and verify both the legend selected state and filtered series view data update to the new legend domain.
+
+**Acceptance Scenarios**:
+
+1. **Given** a discrete legend configured with a custom `data` callback, **When** `updateSpecSync` updates the backing data with `reMake: false`, **Then** the legend still exposes the latest legend items after the update.
+2. **Given** the same chart after `updateSpecSync`, **When** the user clicks a legend item, **Then** VChart updates the legend selected data and re-filters series view data according to the clicked legend item.
+
+### Edge Cases
+
+- The `reCompile` path must rebuild or rebind the underlying vrender legend component after cleanup so event handlers are not lost.
+- Existing discrete legends without a custom `data` callback must keep their current interaction behavior.
+- `reMake: true` behavior must remain unchanged.
+
+## Requirements *(mandatory)*
+
+### Functional Requirements
+
+- **FR-001**: After `updateSpec` on a discrete legend with a custom `data` callback, the legend component MUST use the updated legend item set when `reMake` is false.
+- **FR-002**: After the same update path, clicking a legend item MUST update `selectedData` and trigger the normal series data filtering flow.
+- **FR-003**: Legend cleanup on the `reCompile` path MUST NOT retain a released vrender legend component instance.
+- **FR-004**: Existing discrete legend behavior outside this update path MUST remain backward compatible.
+
+## Success Criteria *(mandatory)*
+
+### Measurable Outcomes
+
+- **SC-001**: In the issue #4566 reproduction, `updateSpec(..., { reMake: false })` no longer disables legend filtering when `legends.data` is a function.
+- **SC-002**: A focused automated regression test proves legend selection and series filtering still work after the update.
diff --git a/specs/011-fix-discrete-legend-filter-after-update-spec/tasks.md b/specs/011-fix-discrete-legend-filter-after-update-spec/tasks.md
new file mode 100644
index 0000000000..4fd90fb642
--- /dev/null
+++ b/specs/011-fix-discrete-legend-filter-after-update-spec/tasks.md
@@ -0,0 +1,28 @@
+# Tasks: Discrete Legend Filtering After updateSpec
+
+**Input**: Design documents from `/specs/011-fix-discrete-legend-filter-after-update-spec/`
+**Prerequisites**: plan.md, spec.md
+
+**Tests**: Include focused regression coverage for discrete legend interaction after `updateSpecSync(..., { reMake: false })`.
+
+## Phase 1: Setup
+
+- [x] T001 Inspect discrete legend update, cleanup, and recompile lifecycle around `BaseLegend` and `DiscreteLegend`
+
+## Phase 2: User Story 1 - Keep Discrete Legend Filtering Active After updateSpec (Priority: P1)
+
+**Goal**: Preserve legend click filtering after `updateSpec` when the legend uses a custom `data` callback and the chart avoids remake
+
+### Tests for User Story 1
+
+- [x] T002 [US1] Add a regression test for `updateSpecSync(..., { reMake: false })` with `legends.data: items => items` in `packages/vchart/__tests__/unit/core/vchart-event.test.ts`
+
+### Implementation for User Story 1
+
+- [x] T003 [US1] Clear the stale vrender legend instance in `packages/vchart/src/component/legend/base-legend.ts` so legend events are rebound on recompile
+
+## Phase 3: Verification
+
+- [x] T004 Run the focused Jest test file for `packages/vchart/__tests__/unit/core/vchart-event.test.ts`
+- [x] T005 Run `npm run compile` in `packages/vchart`
+- [x] T006 Update task tracking after implementation